Custom 1.859 MHz Band Pass Filter 21dB Insertion Loss BNC 1.82-1.90 MHz -3dB

Custom 1.859 MHz Band Pass Filter 21dB Insertion Loss BNC 1.82-1.90 MHz -3dB

This is a custom-built passive band pass filter centered at 1.859 MHz, housed in a compact flanged aluminum enclosure. It features two BNC connectors (labeled IN and OUT) on the front panel and a center tuning knob, with a top-panel label marking the frequency as 1.859 MHz and unit number 028. The filter is designed to pass a narrow band of RF frequencies centered near 1.86 MHz while attenuating signals outside that range.

Specifications & What's Included

• Filter type: Passive band pass filter
• Center frequency: 1.859 MHz (peaks at 1.86 MHz)
• Insertion loss: 21 dB
• −3 dB band limits: 1.82 MHz – 1.90 MHz (80 kHz passband)
• −20 dB limits: 1.74 MHz – 2.00 MHz
• Connectors: 2× BNC (IN and OUT) on front panel
• Tuning knob: center-mounted on front panel
• Enclosure: flanged aluminum, blue-grey powder coat finish
• Unit number: 028 (marked on front panel label)
• Filter only — no cables or documentation included

Applications

Band pass filters at frequencies in the low-MHz range are used in RF and communications systems to isolate a specific frequency channel or signal while rejecting adjacent interference. A filter centered at 1.859 MHz is relevant to applications in the Medium Frequency (MF) and low High Frequency (HF) spectrum, including AM broadcast monitoring, signal analysis, amateur radio experimentation, and custom receiver front-end designs. Custom-built filters like this are also used in laboratory test setups where a precise, narrow passband is needed to condition or characterize signals before feeding them to measurement equipment. The BNC interface makes it straightforward to integrate into standard bench test setups or coaxial RF signal chains.